Lexar NM790 with Heatsink 4TB SSD Review

CrystalDiskMark is a useful benchmark to measure the theoretical performance levels of hard drives and SSD’s. We are using v8.0.

Using the CrystalDiskMark 4K QD1 1 thread benchmark, the read score of 82.42MB/s for the Lexar NM790 with Heatsink is a little slower than the standard drive we looked at. When it came to write performance our review sample was a lot slower than the standard NM790 we tested previously.

Checking out the benchmark result screens, we can confirm the official Sequential ratings of the drive of up to 7,400MB/s and up to 6,500MB/s for read and writes respectively with a best read test figure of 7,437MB/s and a best write result of 6,492MB/s using the default incompressible data test. Switching over to the 0 fill (compressible) settings saw the read performance increase to 7,470MB/s while the write performance dropped to 6,227MB/s.

Those Sequential test results of 7,437MB/s and 6,492MB/s for read and writes respectively are good enough to see the drive in the top five of the Gen 4 consumer drives we've tested to date.

Peak Performance Profile.

We haven't seen an official 4K random performance rating for the NM790 with Heatsink but the controller specs quote support up to 1,000K IOPS for both read and writes. Using the Peak Performance profile test in Crystal Disk Mark 8 we saw a best-read result of 933,057 IOPS, a little slower than the controller rating with writes at 1,045,201 IOPS, a little faster than the official figure.  The figures were good enough to see the drive sit in second place on the results chart.

Again we could confirm the official read figure with the Peak Performance profile test but the write result of 5,473MB/s was not only way short of the official 6,500MB/s maximum rating, it was also a good deal slower than the standard drive.

Real World Profile.

In the Real World profile default tests, the NM790 with Heatsink produced Sequential read/write figures of 5,059MB/s and 5,899MB/s respectively which makes it the third fastest Gen4 drive we've seen to date in this test behind WD's Black SN850X Heatsink model and Crucial's T500 drive.

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